Graduate Thesis Or Dissertation
 

Systematics of Pacific Northwestern species of the genus Gymnomyces inferred from nuclear ribosomal DNA internal transcribed spacer sequences

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d791sm450

Descriptions

Attribute NameValues
Creator
Abstract
  • Gymnomyces is an ectomycorrhizal basidiomycete genus in the family Russulaceae estimated to contain less than 50 species worldwide, with 23 species known to occur in the Pacific Northwest. Gymnomyces species are common in Pacific Northwest forests that include Pseudotsuga, Abies, Tsuga, and Quercus. They produce sequestrate (truffle-like) sporocarps with ornamented amyloid spores, which are a common food resource for a suite of mycophagous, both small and large manirrials. Gymnomyces is one of five sequestrate genera (Macowanites, Gymnomyces, Cystangium, Arcangeliella, and Zelleromyces) long recognized as being more closely related to Russulaceae than to other sequestrate fungi as judged from similarities in spore ornamentation, tissue anatomy, and sporocarp morphology. The russuloid dade, where Gymnomyces resides, exhibits a great diversity of sporocarp morphologies. The hymenomycetous forms include sequestrate, resupinate, pileate, and coralloid, with smooth, toothed, lamellate, or poroid sporocarps forms. This dade is complex because it lacks an obvious morphological synapomorphy uniting all of the unique sporocarp forms. In this study I investigated infrageneric relationships in Gymnoinyces to test current taxonomic hypotheses and species concepts. Through phylogenetic analyses of internal transcribed spacer nuclear ribosomal DNA sequences I found that Gymnomyces does not form a monophyletic group, and the ITS region clearly suggests at least six unique lineages of Gymnomyces. Because the ITS data is consistent with the morphological autapomorphies of both G. ellipsosporus and G. gilkeyae, their removal from the genus Gymnomyces is suggested.
License
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Language
Digitization Specifications
  • PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details Whitbeck_Kristen_L_2003.pdf 2017-10-20 Public Download